Added README.

README.markdown

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+Getopt for Erlang
+=================
+
+Command-line parsing module that uses a syntax similar to that of GNU Getopt.
+
+
+Requirements
+------------
+
+You should only need a somewhat recent version of Erlang/OTP though the module
+has only been tested with Erlang R13B.
+
+
+Installation
+------------
+
+To compile the module you simply run 'make'.
+To run the unit tests run 'make test'.
+To build the (very) limited documentation run 'make docs'.
+
+
+Known limitations
+-----------------
+
+  - The syntax for multiple short options with no argument (e.g. -abc) is not
+    supported yet.
+  - The syntax for non-option arguments that start with '-' (e.g. -a -- -b)
+    is not supported yet.